SOURCE: GPS displays BNG on location
BNG stands for 'British National Grid'
SOURCE: Garmin GPS 12 seems to be a few hundred yards out!
Go into your device and pull up the setup section. There should be a selection that needs to be checked called WAAS. When that is selected your accuracy should be +- 3 meters if I remember correctly. At any rate it will be much more accurate.
SOURCE: Garmin eTrex HC GPS Location settings set to TL
Owner's manual Page 42
Setup > Units > Position Format
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SOURCE: Entering waypoints manually
Notice that when you pull up the MARKed coordinates the yellow cursor is on the N/S letter rather than the number. Since a number is impossible there it won't let you enter one.
Use the rocker to move to the popup screens directional arrows to move to the digit you want to change. This will be easiest with the the RIGHT arrow at first; once you see the cursor it will make sense. Note I am talking about the popup's RIGHT square and not the rocker's RIGHT direction.
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